Network communications system

ABSTRACT

A network communications system is provided for allowing a group of computer users in a conference room or similar small work environment to access an Ethernet local area network (LAN) and to provide peer-to-peer group networking without connection to a backbone network. The system includes multiple (for example, 4 or 8) client computer ports each including a removable spring loaded cable dispenser carrying an extendible/retractable Category 5 LAN cable terminated with an RJ-45 plug for connection to a client computer&#39;s network adapter. Combined power/Ethernet LAN cables connect the system to an enterprise network and to a source of electrical power, and permit cascading of up to three 8-port systems. In use, a computer user pulls out the cable from one of the client ports and inserts the RJ-45 plug into the RJ-45 jack on the network adapter carried by the computer. After completion of the networking session, the user unplugs the cable which is automatically retracted by the spring loaded cable reel. A cable management system is thereby provided which eliminates the tangle or clutter of multiple cables encountered in existing systems.

CROSS REFERENCE TO RELATED APPLICATIONS

This divisional application claims the benefit of U.S. patentapplication Ser. No. 09/534,888 for Network Communications System, filedMar. 24, 2000 now U.S. Pat. No. 6,780,047, Assignee Intel Corporation.

FIELD OF THE INVENTION

The present invention relates generally to data communicationsnetworking and particularly to a network communications system allowinga group of computer users in a conference room or similar small workarea to access a local area network (LAN) and to provide peer-to-peergroup networking and resource sharing without accessing the LAN.

BACKGROUND OF THE INVENTION

The widespread use of notebook and handheld computer systems in businessenvironments has created a need for informal network access andinformation sharing. Mobile users require constant access to the companynetwork for E-mail, internet and intranet services. Small workgroups ofmobile notebook and handheld computer users often assemble for a meetingor a joint task, access and exchange computerized information in an adhoc manner and then disband. There is a need to facilitate this rapidworkgroup “setup and tear down” in a conference room or similar smallwork area allowing two or more computer users to access a network at thesame time, and also to share files, peripherals, and other resourceswithout connection to a backbone network.

The availability of networking connections in conference rooms hasheretofore been limited because of the high cost of custom conferenceroom furniture with integrated LAN jacks. Thus, conference rooms areoften equipped with only one LAN wall jack thereby limiting networkaccess to only one user at a time. In addition, existing LAN hubs andswitches are not designed to be seamlessly integrated into a conferenceroom or similar environment. Thus, placing such a LAN interconnectionapparatus in a conference room requires many individual network cablesto connect users' computers to the apparatus. Conference rooms soequipped are often plagued with a tangle of unsightly cables andsometimes cables are removed from the room. Moreover, mobile computerusers moving about company premises to attend team meetings, viewpresentations or work on group projects, must often carry their ownnetwork cables and search for open network jacks in a conference room orother work area.

SUMMARY OF THE INVENTION

Broadly, the present invention provides a network communications systemfor efficiently connecting a plurality of computer systems with a localarea network in a small work area environment such as a conference room.The system includes a plurality of retractable cables connectable to acorresponding number of computers that eliminate the inevitable tangleof network cables that occur with existing hub and switch products.Further, the system facilitates the inexpensive addition of networkconnectivity to a conference room environment.

In accordance with one specific embodiment of the invention, there isprovided a network communications system for networking a plurality ofcomputers, the system including a plurality of client computer ports,multiport circuitry such as a LAN switch for interconnecting theplurality of client computer ports in the network, and a removable,replaceable, network communications cable dispensing device, preferablyin the form of a spring loaded reel take-up device, associated with eachclient port. The communications cable carried by each cable dispensingdevice has a first portion and a second portion. The first portion ofthe communications cable is fixed relative to the cable dispensingdevice and has an extremity carrying a first connector adapted to becoupled to one of the ports of the multiport interconnecting circuitry.The second portion of the communications cable is extendible from andretractable, under spring load, into the cable dispensing device and hasan extremity carrying a second connector adapted to be coupled to one ofthe computers. In accordance with a preferred embodiment, thecommunications cable comprises flat, Category 5 compliant LAN cableincluding two twisted wire pairs, and the connector at the extremity ofeach of the first and second portions of the communications cablecomprises an RJ-45 modular plug.

Further in accordance with a preferred embodiment, the system includes acombined power/Ethernet LAN cable for connecting the system both to anetwork and to a source of electrical power. In addition, the system mayinclude a combined power/Ethernet LAN cable for coupling the system to asecond network communications system of the invention in cascaded ordaisy chain fashion.

In accordance with another aspect of the present invention, the combinedpower/Ethernet LAN cable comprises a first group of conductorscomprising two twisted wire pairs for transmitting Ethernet LAN signals.The first group of conductors has a first end and a second end, thefirst end being adapted to be connected to the Ethernet LAN. Thecombined cable further includes a second group of conductors comprising,like the first group of conductors, two twisted wire pairs fortransmitting electrical power to the system. The second group ofconductors has a first end and a second end, the first end of the secondgroup of conductors being adapted to be connected to a source ofelectrical power. An RJ-45 modular connector having at least eightcontact positions terminates the second ends of the first and secondgroups of conductors. The conductors of the first group of conductorsare connected to the contacts of a first group of four of the contactpositions of the RJ-45 connector and the conductors of the second groupof conductors are connected to the contacts of a second group of four ofthe contact positions of the RJ-45 connector. EMI/RFI shielding enclosesthe first group of conductors and an insulative jacket encloses both thefirst and second groups of conductors. In accordance with a specificembodiment of this aspect of the invention, the RJ-45 connector has tencontact positions, Nos. 1–10, the conductors of the first group ofconductors being connected to the contacts of contact positions 1–4 andthe conductors of the second group of conductors being connected tocontact positions 7–10. The middle contact positions 5 and 6 of theRJ-45 connector are devoid of contacts to provide electrical isolationbetween the first and second groups of conductors.

In accordance with yet another aspect of the present invention, there isprovided a power/Ethernet LAN adapter assembly comprising an enclosurehaving attached thereto a combined power/Ethernet LAN cable as describedabove; an electrical power cord; and a Category 5 compliant cableterminated with an RJ-45 modular plug for connection to a LAN. Theenclosure contains pass-through conductors interconnecting the Category5 compliant cable with the first end of the first group of conductors ofthe combined power/Ethernet cable, and a power supply interconnectingthe power cord and the first end of the second group of conductors ofthe combined cable.

BRIEF DESCRIPTION OF THE DRAWINGS

Further objects, features and advantages of the invention will becomeevident from the detailed description, below, when read in conjunctionwith the accompanying drawings in which:

FIG. 1 is a schematic representation of a pair of 8-port networkcommunications systems in accordance with a first embodiment of theinvention, with the systems shown placed on a conference room table;

FIG. 2 is a top perspective view of one of the systems shown in FIG. 1;

FIG. 3 is a bottom perspective view of the system shown in FIG. 2;

FIG. 4 is a top perspective view of the system of the invention with thehousing cover removed;

FIG. 5 is a top plan view of the system shown in FIG. 4;

FIG. 6 is a perspective view of a LAN communications cable take-updevice used in connection with the present invention;

FIG. 7 is a top plan view of the cable take-up device of FIG. 6;

FIG. 8 is a top plan view of the system as seen in FIG. 5 with the innerhousing cover removed, exposing the printed circuit board (PCB);

FIG. 9 is a perspective view of the PCB;

FIG. 10 is a block diagram of the electronic circuitry of the firstembodiment of the system;

FIG. 11 is a perspective view of the interior of the housing cover;

FIG. 12 is a simplified, transverse cross section of a portion of thePCB and housing cover, as seen along the line 12—12 in FIG. 1;

FIG. 13 is a top plan view of an adapter assembly including a combinedpower/LAN cable, for connecting a network communications system of theinvention with a source of electrical power and an enterprise EthernetLAN;

FIG. 14 is a top plan view of a combined power/LAN cable for cascadingnetwork communications systems of the present invention;

FIG. 15 is a cross section view of the combined power/LAN cables ofFIGS. 13 and 14 as seen along the lines 15—15 therein;

FIG. 16 is a chart showing the contact assignments of the combinedpower/LAN cables of FIGS. 13 and 14; and

FIG. 17 is a perspective view of a 4-port network communications systemin accordance with a second embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

By way of example, the invention will be described with reference to thewidely used 10/100 Mbps Ethernet local area networks (LANs) typicallyfound in workplace environments. Such Ethernet LANs conform to the IEEE802.3, 802.3u and 802.3x network standards which are incorporated hereinby reference.

Referring first to the schematic representation of FIG. 1, there isshown a network communications system 10 for connecting, for example, aplurality of portable computers 12, 14 and 16 to each other and to anEthernet local area network 18 via an RJ-45 wall jack 20. The specificembodiment of the system 10 shown in FIG. 1 has eight (8) client orcomputer ports 22 for connecting as many computers.

The computers 12, 14 and 16 typically comprise notebook or handheldcomputers provided with network interface cards or adapters 24. Examplesof such adapters 24 are the Ethernet PC Cards and Ethernet/Modem ComboPC Cards manufactured by Xircom, Inc., Thousand Oaks, Calif. A flat,Category 5 compliant LAN cable 26 terminated with an RJ-45 modular plug28 connects each of the computers 12, 14 and 16 with the system 10. Thesystem 10 is a compact unit designed to be placed on a conference roomtable top 30 a portion of which is shown in FIG. 1. A default mode forthe operation of the system 10 might be client-to-enterprise LAN access.The network communications system 10 may also operate as a stand aloneclient concentrator facilitating networking among the users within aconference room with or without connection to a backbone network.

The network communications system 10 is connectable to a standardelectrical power wall outlet 32 and to the Ethernet LAN 18 by means ofan adapter assembly 34. The adapter assembly 34 includes a power cord 36for connection to the wall outlet 32; an Ethernet LAN cable 38terminated with an RJ-45 modular plug 40 for connection to the LAN walljack 20, and a combined power/Ethernet LAN cable 42 described in greaterdetail below. In addition, in accordance with a preferred embodiment ofthe invention, the system 10 may be coupled to a second, cascadednetwork communications system 44. Up to three (3) 8-port systems may be10 cascaded or daisy chained in this fashion thereby facilitating thenetworking of up to twenty-four (24) computers. Such cascading iseffected by means of combined power/Ethernet LAN daisy chain cables 46and 48, also described in greater detail below.

With reference now also to FIGS. 2–5, the system 10 comprises an outerhousing 50 including a base 52 and a cover 54, each preferablyfabricated of molded plastic. The base 52 of the outer housing 50includes a bottom wall 56 having inner and outer surfaces 58 and 60, andopposite side walls 62 and 64 defining the eight (8) client computerports 22 from each of which a flat LAN cable 26 may be pulled out by auser for connection to a computer. Four rubber feet 66 attached tobottom wall 56 adjacent the corners thereof help resist any tendency forthe system 10 to slide along the table top 30 when a cable is withdrawnfrom a client port 22. The four client ports 22 along one side 62 of thebase 52 are in transverse alignment with the four client ports 22 alongthe other side 64 of the base 52, as best seen in FIG. 5. The cover 54has a generally horizontal top wall 68 having an inner surface 70 and anouter surface 72.

The inner surface 58 of the bottom wall 56 of the base 52 defines eight(8) wells 80 each of which is positioned adjacent one of the clientports 22. With reference now also to FIGS. 6 and 7, removably mountedwithin each of the wells 80 is a generally cylindrical Communicationscable dispenser 82. The dispensers 82 are identical; each preferablytakes the form of a take-up device containing a spring loaded reelcarrying communications cable 84. A cable dispenser or take-up device ofthe type that may be used with the present invention is generallydisclosed in U.S. Pat. Nos. 5,797,558 and 5,655,726, which patents areincorporated herein by reference. As already indicated, in the preferredembodiment under consideration, the communications cable 84 carried bythe reel of each cable dispenser 82 is in the form of flat, Category 5twisted pair 10/100 Mbps Ethernet transceiver cable. Each cabledispenser 82 has a casing 86 including two projections 88 and 90 on theouter surface thereof. The projection 88 has a transverse surface 92 andthe projection 90 has a transverse surface 94. The cable 84 of eachcable dispenser 82 has a first portion 96 that emerges from an aperturein the transverse surface 92 of the projection 88. The first portion 96of the cable 84 is fixed, that is, it is non-extendible relative to thecable dispenser 82. The cable 84 includes as a second portion the cablelength 26 that is extendible from an aperture in the transverse surface94 of the projection 90 against a resilient bias provided, for example,by a flat coil spring within the dispenser 82, and is therebyretractable into the dispenser. Further, in the present invention, thecable dispenser preferably includes a mechanism for allowing the cableto be latched in an extended state to relieve strain on the cable duringuse. A mechanical switch 100 in the top surface 101 of the cabledispenser casing 86 allows a user to select latching or non-latchingreel operation. The length of the second portion 26 of the cable 84 iscompatible with typical conference room environments, for example, sixto eight feet long. The first and second portions 96 and 26 of the cable84 have ends 102 and 104, respectively, carrying an RJ-45 modular plug106 and the RJ-45 modular plug 28. The plug 28 has a rear surface 110provided with a slotted, resilient pad 112 that engages the transversesurface 94 of the projection 90 on the casing 86 to absorb shock in theevent a user suddenly releases the extended cable portion 26. Mounted onthe top surface 101 of the dispenser casing 86 and extending along adiameter thereof, is an upwardly projecting, flat grip or handle 114facilitating the lifting of the cable dispenser 82 and the removalthereof from its associated well 80. Adjacent the inner end 116 of thehandle 114 and disposed perpendicular thereto is a short, upstandingabutment 118.

The base 52 of the system 10 includes a molded plastic inner housing 130extending the length of the base. The inner housing 130 has a horizontalupper wall 132 that defines eight (8) longitudinally spaced jackapertures 134 and four transverse channels 136, each channel being inalignment with a pair of opposed client ports 22. The inner housing 130further includes a generally vertical wall 138 defining eight (8)arcuate recesses 140 for receiving the inner portions of the cabledispensers 82. A portion of the vertical wall 138 in each arcuate recess140 is slotted (at 142) so as to define a generally U-shaped, resilienttab 144 hinged along the bottom thereof. The resilient tab 144 carriesan outwardly projecting latch 146 that engages the top of the abutment118 on the top of the associated cable dispenser 82 to lock thedispenser in place and prevent it from being lifted. To remove a cabledispenser 82 for replacement, the associated resilient tab 144 ispressed inwardly, that is, away from the dispenser, thereby causing thelatch 146 to clear the associated abutment 118 thus allowing thedispenser to be lifted out of its well 80 by means of the handle 114.Projecting upwardly from the inner surface 58 of the bottom base wall 56is a stop 148 that engages the transverse surface 94 on the dispenserprojection 90. The stop 148 thereby prevents the cable dispenser 82 fromrotating counterclockwise within its well 80 when the second portion 26of the cable 84 is withdrawn from the dispenser.

FIG. 8 is a top plan view of the base of the communications system withthe inner housing 130 removed thereby exposing a printed circuit board(PCB) 150 extending substantially the length of the base 52. FIG. 9 is aperspective of the PCB 150. Mounted on one surface of the PCB 150 arefirst and second monolithic integrated circuits 152 and 154 comprisingnetwork interconnection circuitry preferably in the form of LANswitches. Mounted on the other surface of the PCB 150 opposite the LANswitch IC's 152 and 154 are heat sinks 156 and 158, respectively, fortransferring heat away from the switches. The PCB 150 also carries aninverted 10-contact RJ-45 jack 160 at one end, of the PCB 150 forconnection to the combined power/Ethernet LAN cable 42 of the adapterassembly 34, and an inverted 10-contact RJ-45 jack 162 at the other endof the PCB 150 for connecting the system 10 to the second communicationssystem 44 by means of the combined power/Ethernet LAN daisy chain cable46. The PCB 150 further carries eight (8) upright client port RJ-45jacks 164 intermediate the ends of the PCB. The jacks 164 are arrangedas two pairs 164 a, 164 b of individual jacks and a central jack complex164 c integrating the remaining four RJ-45 jacks 164 in a single unit.With the inner housing 130 in place in the base 52, the eight clientport jacks 164 carried by the PCB line up with the jack apertures 134 inthe upper wall 132 of the inner housing 130.

FIG. 10 is a high-level block diagram of the electronics of the 8-portnetwork communications system 10. As shown in FIG. 10, the first switch152 may comprise, by way of example, a Model BCM5308 single chip, 3.3volt 10/100 BASE-T/TX 9-port switch manufactured by Broadcom Corp. Thesecond switch 154 may comprise a Model BCM5304 single chip, 3.3 volt10/100 BASE-T/TX 5-port switch also manufactured by Broadcom Corp. Theswitches 152 and 154 are connected by an expansion bus 168 and arecoupled to SRAM buffer memories 170 and 172, respectively. Sixtransmit/receive ports of the first switch 152 interface with theenterprise power/Ethernet RJ-45 jack 160 and five of the client portRJ-45 jacks 164 which receive the mating RJ-45 plugs 106 on the ends 102of the fixed cable portions 96. Three transmit/receive ports of thesecond switch 154 interface with the RJ-45 jacks 164 of the remainingthree client ports. A fourth transmit/receive port of the second switch154 interfaces with the cascade or daisy chain RJ-45 jack 162. Apass-through 24 vdc power bus 174 for supplying cascaded systems such asthe system 44 is connected between the power/Ethernet and daisy chainjacks 160 and 162. Connected to the 24 vdc bus 174 is a regulator 176for supplying 3.3 vdc to the various IC's carried by the PCB 150.

The use of multiport network interconnecting circuits such as the LANswitches 152 and 154 and their connection to LAN port jacks are wellknown in the art and need not be described in greater detail. It willalso be obvious to those skilled in the art that instead of a LANswitching arrangement, the system may be set up as a less expensive,conventional concentrator or repeater hub.

The system 10 also includes means for providing a visual indication ofthe status of each of the client ports 22. With reference to FIGS. 4 and5, with the inner housing 130 in place, four portions 178 of the PCB 150are exposed by the transverse channels 136 defined by the inner housing.With reference also to FIGS. 8, 9 and 12, each of the exposed portions178 of the PCB carry a set of three status indicating LEDs 180–182 oneach side of the PCB, each set of LEDs being associated with one of theclient ports 22. The LEDs of each set are vertically aligned with theupper two LEDs 180 and 181 in close proximity to each other and thethird LED 182 being below and spaced apart from the upper pair. Theupper pair of LEDs 180, 181 of each LED set indicates (through 2different colors) link integrity, that is, whether a good 10 Mbps or 100Mbps connection has been made, while the third LED 182 of each setindicates LAN send/receive activity. Light from the LEDs is transmittedto the exterior surface 72 of the cover 154 via light pipes of Lexan orthe like. Specifically, as shown in FIGS. 11 and 12, each client porthas associated with it a pair of vertically aligned, upper and lower,L-shaped light pipes 184 and 186 carried by the inner surface 70 of thecover 54. The light pipe 184 has an inner end 184 a and an outer end 184b. Likewise, the light pipe 186 has inner and outer ends 186 a and 186b. With the outer housing cover 54 in place, the inner end 184 a of theupper light pipe 184 is positioned to receive light from one or theother of the LEDs 180, 181 of the upper LED pair; similarly, the innerend 186 a of the lower light pipe 186 is positioned to receive lightfrom the lower LED 182 when the cover 54 is in place. The outer ends 184b and 186 b of the light pipes 184 and 186 communicate with the outersurface 72 of the cover 54 and thus light transmitted by the light pipesfrom the LEDs is visible to the users of the system to indicate thestatus of each client port 22. The use of LEDs to indicate the status ofLAN ports is well known in the art, being routinely used, by way ofexample, in connection with network interface cards or adapters such asthose mentioned above.

FIG. 13 shows the details of the adapter assembly 34 for connecting thesystem 10 to the enterprise LAN 18 and the source of electrical power32. The adapter assembly 34 comprises an enclosure 190, the combinedpower/Ethernet LAN cable 42 extending from one end of the 20 enclosure190, and the 120 vac power cord 36 and Category 5 compliant Ethernet LANcable 38 extending from the other end of the enclosure 190. Withreference also to FIGS. 3 and 10, the combined power/Ethernet LAN cable42 has first and second ends 42 a and 42 b and is terminated at the end42 b with a 10-contact position RJ-45 modular plug 192 for connection tothe internal jack 160, while, as already indicated, the LAN cable 38 isterminated with an eight contact RJ-45 modular plug 40 for connection tothe wall LAN jack 20. The enclosure 190 contains a PCB 194 carrying a120 vac-to-24 vdc power supply 196 connected to the power cord 36 andconductors 198 providing a pass-through for the Ethernet LAN signals. Byway of example, the overall length of the adapter assembly of FIG. 13may be 25 feet.

As shown in the cross section of FIG. 15, the combined power/Ethernetcable 42 includes a core group of Category 5 compliant conductorscomprising two twisted wire pairs 200/201 and 202/203 connected to thepass-through conductors 198 for transmitting network signals. The coregroup of conductors 200–203 is encased in insulative filler material(for example, fibrillated polypropylene) 204 in turn enveloped by atubular, double sided aluminum foil/mylar EMI/RFI shield 206 having adrain line 208. The shielding 206 is surrounded by fibrillatedpolypropylene filler 210 which in turn is enveloped by a braided EMI/RFIshield 212 and an outer tubular insulative jacket 214 of, for example,flexible PVC. Embedded in the filler 210 is an outer group of conductorscomprising two twisted wire pairs 216/217 and 218/219 connected to thepower supply 196 for supplying 24 vdc electrical power to the system 10.

With reference to FIG. 14, the combined power/LAN cable 46 for cascadingthe systems 10 and 44 is identical to the combined power/LAN cable 42 ofthe adapter assembly 34 except that the cascading cable 46 is terminatedat each of the first and second ends 46 a and 46 b with a 10-contactRJ-45 modular plug 220. With reference also to FIGS. 3 and 10, tocascade the systems of the invention, one of the plugs 220 is insertedin the daisy chain RJ-45 jack 162 of the first system such as the system10 while the other plug 220 is inserted in the enterprise RJ-45 jack 160of the second system such as the system 44. The overall length of thecable 46 may be 6 feet, for example.

FIG. 16 is a chart listing the pin or contact assignments of the mating10-contact RJ-45 modular plugs and jacks used in the system of thepresent invention. Thus, the conductors 200/201 and 202/203 of the coreor LAN group of conductors are connected to, contact Nos. 1–4 while theconductors 216/217 and 218/219 of the outer or power group of conductorsare connected to contact Nos. 7–10. Middle contact positions Nos. 5 and6 are devoid of contacts so as to provide additional electricalisolation between the two groups of conductors.

With reference again to FIGS. 3–5 and 8, in the event heat dissipationfrom the LAN switch ICs 152 and 154 through the use of heat sinks 156,158 alone is insufficient, a cooling fan 230 housed within a slottedenclosure 232 at one end of the system 10 may be provided. Cooling airdischarge slots 234 formed in the bottom wall 56 of the base 52 at theother end of the system 10 vent cooling air flowing along the length ofthe PCB 150.

With reference to FIG. 17, there is shown an alternative embodiment ofthe invention comprising a system 240 having four client computer ports242 two of which are visible in FIG. 17. It will be evident that thepreceding detailed description applies equally to the four port versionof the invention, except that typically only a single LAN switching ICwould be required.

While the invention has been particularly shown and described withreference to preferred embodiments thereof, it will be understood bythose skilled in the art that the foregoing and other changes in formand detail may be made therein without departing from the scope of theinvention as defined by the appended claims. For example, it will beappreciated by those skilled in the art that the invention is equallyapplicable to “small office/home office” (SOHO) environments.

1. A combined power and data cable comprising: a first group ofconductors comprising two twisted wire pairs to transmit data signals,the first group of conductors having a first end and a second end, thefirst end being adapted to be connected to a data network; a secondgroup of conductors extending generally parallel with the first group ofconductors and comprising two twisted wire pairs to transmit electricalpower, the second group of conductors having a first end and a secondend, the first end of the second group of conductors being adapted to beconnected to a source of electrical power; a connector terminating thesecond ends of the first and second groups of conductors, the connectorhaving at least eight contact positions, the conductors of the firstgroup of conductors being connected to a first group of the contactpositions of the connector and the conductors of the second group ofconductors being connected to a second group of the contact positions ofthe connector; an insulative jacket enclosing the first and secondgroups of conductors; and a first EMI/RFI shield enclosing the firstgroup of conductors.
 2. The cable of claim 1, wherein the first group ofconductors consists of four conductors.
 3. The cable of claim 2, whereinthe second group of conductors consists of four conductors.
 4. The cableof claim 1, wherein the connector comprises a modular RJ-45 connector.5. The cable of claim 1, wherein the network comprises an Ethernet localarea network.
 6. The cable of claim 1, further comprising a secondEMI/RFI shield surrounding the first shield, the second group ofconductors being disposed between the first and second shields.
 7. Thecable, of claim 1, wherein the connector has ten contact positions 1–10,to conductors of the first group of conductors being connected tocontact positions 1–4 and the conductors of the second group ofconductors being connected to contact positions 7–10.
 8. The cable ofclaim 7, wherein the intermediate contact positions 5 end 6 of theconnector are devoid of electrical contacts to provide electricalisolation between the first and second groups of conductors.
 9. Thecable of claim 8 further comprising a second connector terminating thefirst and second groups of conductors at the first ends thereof, thesecond connector having at least eight contact positions, the conductorsof the first group of conductors being connected to a first group offour of the contact positions of to second connector and the conductorsof the second group of conductors being connected to a second group offour of the contact positions of the second connector.
 10. The cable ofclaim 9, wherein the second connector has ten contact positions 1–10,the conductors of the first group of conductors being connected tocontact positions 1–4 and the conductors of the second group ofconductors being connected to contact positions 7–10.
 11. The cable ofclaim 10, wherein intermediate contact position 5 and 6 of the secondconnector are devoid of electrical contacts to provide electricalisolation between the first and second groups of conductors.
 12. A powerand data adapter assembly comprising: a set of combined power and datacables, each cable including a first group of conductors having twotwisted wire pairs to transmit data signals, a second group ofconductors extending generally parallel with the first group ofconductors and also having two twisted wire pairs to transmit electricalpower, and a computer connection plug terminating one end each cable,each cowpnter connection plug having at least eight contact positions,the conductors of the first group of conductors being connected to afirst group of the contact positions of the computer connection plug andthe conductors of the second group of conductors being connected to asecond group of the contact positions of the computer connection plug;an electrical power cord; a computer network connection cable to connectto a network; and an enclosure attached to the combined power and datacables, the electrical power cord and the computer network connectioncable, the enclosure containing conductors interconnecting the computernetwork connection cable and an end of the first group of conductors ofeach cable, and a power supply interconnecting the power cord and an endof the second group of conductors of each cable.
 13. The assembly ofclaim 12, wherein the computer connection plugs comprise RJ-45 modularplugs.
 14. The assembly of claim 12, further comprising an insulativejacket enclosing the first and second groups of conductors.
 15. Theassembly of claim 14, wherein the insulative jacket comprises a firstEMI/RFI shield enclosing the first group of conductors.
 16. The assemblyof claim 15, wherein the insulative jacket comprises a second EMI/RFIshield surrounding the first shield, to second group of conductors beingdisposed between the first and second shields.
 17. A combined power anddata cable comprising: a first group of conductors to transmit datasignals, the first group of conductors having a first end and a secondend, the first end being adapted to be connected to a data network, thefirst group of conductors comprising two twisted wire pairs; a secondgroup of conductors extending generally parallel with the first group ofconductors to transmit electrical power, the second group of conductorshaving a first end and a second end, the first end of the second groupof conductors being adapted to be connected to a source of electricalpower the second group of conductors comprising two twisted wire pairs;a first EMI/RFI shield enclosing the first group of conductors; a secondEMI/RFI shield surrounding the first shield, the second group ofconductors being disposed between the first and second shields; and aninsulative jacket enclosing the first and second groups of conductors.18. The cable of claim 17, further comprising a connector terminatingthe second ends of the first and second groups of conductors, theconnector having at least eight contact positions, the conductors of thefirst group of conductors being connected to a first group of thecontact positions of the connector and the conductors of the secondgroup of conductors being connected to a second group of the contactpositions of the connector.
 19. The cable of claim 18, whereinintermediate contact position 5 and 6 of the connector are devoid ofelectrical contacts to provide electrical isolation between the firstand second groups of conductors.